Textbook Question
Determine the number of moles (of molecules or formula units) in each sample. a. 55.98 g CF2Cl2
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Ch.3 - Molecules and Compounds
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
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Table of contents
- Ch.1 - Matter, Measurement & Problem Solving118
- Ch.2 - Atoms & Elements106
- Ch.3 - Molecules and Compounds131
- Ch.4 - Chemical Reactions and Chemical Quantities56
- Ch.5 - Introduction to Solutions and Aqueous Solutions82
- Ch.6 - Gases114
- Ch.7 - Thermochemistry96
- Ch.8 - The Quantum-Mechanical Model of the Atom60
- Ch.9 - Periodic Properties of the Elements90
- Ch.10 - Chemical Bonding I: The Lewis Model89
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory85
- Ch.12 - Liquids, Solids & Intermolecular Forces51
- Ch.13 - Solids & Modern Materials47
- Ch.14 - Solutions90
- Ch.15 - Chemical Kinetics115
- Ch.16 - Chemical Equilibrium68
- Ch.17 - Acids and Bases136
- Ch.18 - Aqueous Ionic Equilibrium153
- Ch.19 - Free Energy & Thermodynamics93
- Ch.20 - Electrochemistry106
- Ch.21 - Radioactivity & Nuclear Chemistry74
- Ch.22 - Organic Chemistry140
Chapter 3, Problem 72b
Determine the number of moles (of molecules or formula units) in each sample. b. 23.6 kg Fe(NO3)2
Verified step by step guidance1
Convert the mass of the sample from kilograms to grams. Since 1 kg = 1000 g, multiply 23.6 kg by 1000 to get the mass in grams.
Calculate the molar mass of Fe(NO_3)_2. To do this, add the atomic masses of all the atoms in the formula: Fe, N, and O. Use the periodic table to find these atomic masses.
The molar mass of Fe(NO_3)_2 is the sum of the atomic masses: 1 Fe, 2 N, and 6 O. Calculate this value.
Use the formula: number of moles = mass (g) / molar mass (g/mol). Substitute the mass in grams and the molar mass you calculated into this formula.
Solve the equation to find the number of moles of Fe(NO_3)_2 in the sample.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Moles and Avogadro's Number
A mole is a unit in chemistry that represents 6.022 x 10^23 entities, such as atoms or molecules. This concept is fundamental for converting between the mass of a substance and the number of moles, allowing chemists to quantify and compare amounts of different substances.
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Moles and Particles Conversion
Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule. For Fe(NO3)2, the molar mass is essential for converting the given mass (23.6 kg) into moles.
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Unit Conversion
Unit conversion is the process of converting a quantity expressed in one set of units to another. In this context, it involves converting kilograms to grams (1 kg = 1000 g) to facilitate the calculation of moles from mass using the molar mass of Fe(NO3)2.
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